President Donald Trump pushed his case on Monday for the total denuclearization of North Korea, predicting on the eve of his second summit with North Korean dictator Kim Jong Un that Kim would ultimately make the "wise decision” to end his nation's nuclear program.

Despite appearing Sunday to temper expectations for his meeting with Kim later this week — telling state governors that “I don’t want to rush anybody” to denuclearize and that “as long as there’s no testing, we’re happy” — Trump on Monday pushed his argument for winding down North Korea’s weapons program sooner rather than later.

“Meeting for breakfast with our Nation’s Governors - then off to Vietnam for a very important Summit with Kim Jong Un,” he tweeted. “With complete Denuclearization, North Korea will rapidly become an Economic Powerhouse. Without it, just more of the same. Chairman Kim will make a wise decision!”

The pressure of Trump’s upcoming meeting with Kim coupled with the minimal progress toward denuclearization that came out of the historic first summit has caused some of the president’s allies to worry that in his eagerness for a deal, Trump will make disproportionate concessions to Kim this week.